US4466522A - Electromagnetic spring-wound clutch - Google Patents

Electromagnetic spring-wound clutch Download PDF

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Publication number
US4466522A
US4466522A US06/283,342 US28334281A US4466522A US 4466522 A US4466522 A US 4466522A US 28334281 A US28334281 A US 28334281A US 4466522 A US4466522 A US 4466522A
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United States
Prior art keywords
clutch
clutch armature
driving member
driving
electromagnetic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/283,342
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English (en)
Inventor
Tsunenori Shibuya
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bosch Corp
Original Assignee
Diesel Kiki Co Ltd
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Filing date
Publication date
Application filed by Diesel Kiki Co Ltd filed Critical Diesel Kiki Co Ltd
Assigned to DIESEL KIKI CO., LTD., A CORP. OF JAPAN reassignment DIESEL KIKI CO., LTD., A CORP. OF JAPAN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SHIBUYA, TSUNENORI
Assigned to DIESEL KIKI CO.LTD. reassignment DIESEL KIKI CO.LTD. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SHIBUYA, TSUNENORI
Application granted granted Critical
Publication of US4466522A publication Critical patent/US4466522A/en
Assigned to ZEZEL CORPORATION reassignment ZEZEL CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: DIESEL KOKI CO., LTD.
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D27/00—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor
    • F16D27/10—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings
    • F16D27/105—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings with a helical band or equivalent member co-operating with a cylindrical coupling surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D27/00—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor
    • F16D2027/008—Details relating to the magnetic circuit, or to the shape of the clutch parts to achieve a certain magnetic path

Definitions

  • This invention relates to electromagnetic clutches, and more particularly to electromagnetic spring-wound clutches for use in refrigerant compressors for automotive air conditioners or other like devices.
  • a refrigerant compressor which is used in an automotive air conditioner is provided with an electromagnetic clutch which is arranged between the compressor and the output shaft of an automotive engine associated with the air conditioner to transmit torque from the engine to the compressor.
  • an electromagnetic clutch is a spring-wound type comprising a driving member and a driven member axially aligned with each other for rotation about a common axis, a coil spring mounted around the driving and driven members for gripping engagement therewith and operatively connected at its one end to the driven member, and a clutch armature plate operatively connected to the other end of the coil spring.
  • the clutch armature plate When the electromagnetic clutch is actuated, the clutch armature plate is drawn into frictional contact with a radial wall formed on the driving member due to electromagnetic force produced in an electromagnetic coil provided in the clutch, to cause the coil spring to be wound into gripping engagement with the driving and driven members to effect driving connection between the driving member and the driven member.
  • At least one second clutch armature member is rotatably interposed between a driving member and a first clutch armature member.
  • This second clutch armature member is mounted on the driving member for frictional engagement with a radially extending surface formed on the driving member.
  • the driving member and first and second clutch armature member are disposed immediately adjacent each other and in axial alignment with each other.
  • FIG. 1 is a cross-sectional view of a conventional electromagnetic spring-wound clutch
  • FIG. 2 is a fragmentary cross-sectional view of an electromagnetic spring-wound clutch according to an embodiment of the present invention
  • FIG. 3 is a perspective view of an auxiliary clutch armature plate applicable to the electromagnetic spring-wound clutch.
  • FIG. 4 is a perspective view of a clutch armature plate applicable to the electromagnetic spring-wound clutch.
  • FIG. 1 illustrates in cross section a conventional electromagnetic spring-wound clutch of the aforementioned kind.
  • This clutch is especially adapted to be installed between the output shaft of an automotive engine and a refrigerant compressor for automotive air conditioners to transmit torque from the engine to the compressor.
  • Reference numeral 1 designates a pulley 1 which is intended to serve as a driving member adapted for engagement with the output shaft of an automotive engine, not shown, to be rotatively driven by the engine.
  • a hub 2 is arranged in axial alignment with the pulley 1 for rotation about a common axis, and is secured to the drive shaft (the driven shaft) 3 of a refrigerant compressor, not shown.
  • a coil spring 4 is disposed around both a boss 1a formed on the pulley 1 and axially extending toward the hub 2 and the hub 2 for gripping engagement therewith.
  • the coil spring 4 has its one end 4a engaged in an engaging groove 2a formed in the hub 2 and its other end 4b in an engaging groove 5a formed in a clutch armature plate 5 which is axially movably fitted on the boss 1a of the pulley 1, respectively.
  • Reference numeral 8 designates a retainer member which has a tubular axial extension 8a formed at its central portion on which is fitted a radial ball bearing 9.
  • the pulley 1 has its boss 1a fitted on the retainer member 8 via this radial ball bearing 9 for rotation relative to the member 8.
  • the retainer member 8 is to be secured to one end of the refrigerant compressor, not shown, by means of bolts 10.
  • a cover 11 is secured to the hub 2 by means of bolts 12, only one of which is shown, each threadedly inserted in the hub 2, in a fashion enclosing the coil spring 4, the clutch armature plate 5, etc.
  • An annular recess 1c is formed in the pulley 1 at its end remote from the coil spring 4 and the clutch armature plate 5, which recess forms a stationary coil housing in cooperation with a peripheral edge of the retainer member 8, in which is mounted an electromagnetic coil 6.
  • the hub 2 has an axially inwardly extending boss 2b penetrated by and keyed to one end of the drive shaft 3 by means of a key 13 for the drive shaft 3 to rotate in unison with the hub 2.
  • the drive shaft 3 in turn is secured to the hub 2 by means of a nut 14 threadedly fitted on a tip of the shaft 3.
  • the speed at which the clutch armature plate 5 is drawn toward the pulley 1 due to magnetic attraction and the speed at which the coil spring 4 is wound onto the pulley 1 and the hub 2 are substantially equal to each other.
  • the clutch is actuated when the engine is rotating at a high speed, that is, the pulley 1 is being rotated at a correspondingly high speed, much larger impact load is abruptly imparted to the driven shaft and its related parts than the value of torque loaded on them during usual operation, which may cause deformation or breakage of the component parts of the driven device, that is, the refrigerant compressor and the electromagnetic clutch.
  • there occurs an abrupt collision between the coil spring 4 and the parts onto which the coil spring 4 is wound which causes the occurrence of frictional noise as well as large abrasion in the coil spring and its surrounding parts.
  • FIG. 2 there is shown a fragmentary cross-sectional view of an electromagnetic spring-wound clutch according to an embodiment of the present invention.
  • the other portions of the clutch than those illustrated are substantially identical in shape and arrangement with corresponding ones of the conventional clutch illustrated in FIG. 1.
  • corresponding parts to those in FIG. 1 are designated by like reference characters.
  • an auxiliary clutch armature plate 7 is interposed between the clutch armature plate 5 and the pulley 1 for rotation relative to the members 5, 1.
  • This plate 7 is axially movably fitted on the boss 1b of the pulley 1 and disposed opposite the frictional engagement wall 1b of the pulley 1.
  • the pulley 1, the clutch armature plate 5 and the auxiliary clutch armature plate 7 are arranged immediately adjacent each other and in axial alignment with each other. They can be all brought into and kept in direct frictional engagement with each other in one body upon and during engagement of the clutch.
  • the auxiliary clutch armature plate 7 is formed of an annular member made of a magnetic material and formed with a plurality of holes 7a axially extending therethrough and circumferentially arranged at equal intervals.
  • the holes 7a each have a circumferentially elongate shape.
  • the auxiliary clutch armature plate 7 may have a plurality of, e.g., three permanent magnets 15 embedded in and end face facing toward the pulley 1 in such a manner that the exteriorly exposed surfaces of the magnets 15 are flush with the associated end surface of the armature plate 7.
  • the magnets 15 cause the armature plate 7 to be attracted toward and held in contact with the friction engagement wall 1b of the pulley to prevent the occurrence of noise which could otherwise be caused by vibration or swinging of the armature plate 7 in a free state.
  • the magnets 15 should have weak magnetic force enough to permit the armature plate 7 to slip on the wall 1b upon energization of the electromagnetic coil 6, as hereinlater described.
  • the magnets 15 may be similarly embedded in the above wall 1b of the pulley.
  • the clutch armature plate 5 is formed of an annular member similar in shape to a conventional one, as shown in FIG. 4, which is formed at its inner peripheral wall with an engaging groove 5a in which one end of the coil spring 4 is to be engaged.
  • a magnetic flux path is formed which is configurated as indicated by the dotted line a in FIG. 2 owing to the presence of the holes 7a in the plate 7, and which starts from the magnetic coil 6, and extends through the retainer member 8, the pulley 1, the auxiliary clutch armature plate 7, the clutch armature plate 5, and again through the auxiliary armature plate 7 and the pulley 1, and returns to the retainer member 8.
  • the magnetic flux causes attraction of the clutch armature plate 5 and the auxiliary clutch armature plate 7 toward the pulley 1 to bring the plate 5 and the auxiliary clutch armature plate 7 into frictional engagement with the radial wall 1b of the pulley 1.
  • the above slippage of the armature plates 5, 7 cases displacement of same with respect to the rotational angle of the pulley 1 in the direction opposite to the rotating direction of the pulley 1, that is, the winding direction of the coil spring 4 so that the winding speed of the coil spring 4 is lower that the engaging or drawn speed of the clutch armature plate 5, thus reducing the impact load to be imparted to the hub 2 and the driven shaft 3.
  • the winding speed of the coil spring 4 decreases in inverse proportion to the amount of relative slippage between the pulley radial wall 1b and the clutch armature plate 5.
  • the arrangement of the invention is particularly effective in restraining the impact load to be imparted to the driven shaft when the clutch is actuated under a high engine speed condition.
  • the amount of relative slippage between the radial wall 1b of the pulley 1 and the clutch armature plate 5 caused upon actuation or engagement of the clutch can be adjusted by suitably selecting the size, location or number of the holes 7a formed in the auxiliary clutch armature plate 7 or the thickness of the plate 7, etc. so as to control the amount of magnetic flux passing the plate 7.
  • only one auxiliary clutch armature plate 7 is used. However, a plurality of such plates may be used, if required.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Pulleys (AREA)
US06/283,342 1980-07-15 1981-07-14 Electromagnetic spring-wound clutch Expired - Fee Related US4466522A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1980099393U JPS5721833U (enrdf_load_stackoverflow) 1980-07-15 1980-07-15
JP55-99393 1981-07-15

Publications (1)

Publication Number Publication Date
US4466522A true US4466522A (en) 1984-08-21

Family

ID=14246247

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/283,342 Expired - Fee Related US4466522A (en) 1980-07-15 1981-07-14 Electromagnetic spring-wound clutch

Country Status (2)

Country Link
US (1) US4466522A (enrdf_load_stackoverflow)
JP (1) JPS5721833U (enrdf_load_stackoverflow)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5135086A (en) * 1990-08-17 1992-08-04 Star Precision Tools, Inc. Assembly tool with rapid release electromagnetic clutch
US5240313A (en) * 1990-09-17 1993-08-31 Sumitomo Electric Industries, Ltd. Estimated vehicle speed detection apparatus for motorcycles
US5598913A (en) * 1995-06-07 1997-02-04 Ntn Corporation One-way over-running clutch pulley
US6394248B1 (en) 2000-05-31 2002-05-28 Ntn Corporation Compression spring complaint one-way over-running clutch pulley
US6581743B2 (en) * 2000-07-10 2003-06-24 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Electromagnetic spring clutches
US6676548B2 (en) * 2000-10-26 2004-01-13 Koyo Seiko Co., Ltd. Fixing structure of a pulley unit
US20060201769A1 (en) * 2005-02-24 2006-09-14 Sanden Corporation Electromagnetic clutch for compressor
US20070289831A1 (en) * 2006-06-15 2007-12-20 Masaki Ota Power transmission mechanism
US20090272615A1 (en) * 2008-05-05 2009-11-05 Buzzard Brian W Permanent magnet wrap spring clutch
US20100122882A1 (en) * 2008-11-17 2010-05-20 Komorowski Jacek S Driven accessory with low-power clutch for activating or de-activating same
US20100230227A1 (en) * 2008-11-17 2010-09-16 Scott Parsons Driven accessory with low-power clutch for activating or de-activating same
US9068603B2 (en) 2010-08-24 2015-06-30 Litens Automotive Partnership Clutched driven device and associated clutch mechanism
WO2019014777A1 (en) * 2017-07-20 2019-01-24 Litens Automotive Partnership ROTARY CLUTCH ASSEMBLY WITH ACTUATOR HAVING TWO COMPONENT FRAME ASSEMBLED BY VISSING
US20230167883A1 (en) * 2020-04-28 2023-06-01 Dayco Europe S.R.L. Improved filtering pulley, system comprising such pulley and related control method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735847A (en) * 1972-03-20 1973-05-29 Gen Motors Corp Electromagnetic spring-wound clutch
US3746137A (en) * 1972-07-07 1973-07-17 Bell & Howell Co Multiple-torque slip clutch
US3831723A (en) * 1973-04-18 1974-08-27 Gen Motors Corp Electromagnetic spring-wound clutch
US4225027A (en) * 1977-09-28 1980-09-30 Diesel Kiki Co., Ltd. Electromagnetic spring-wound clutch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735847A (en) * 1972-03-20 1973-05-29 Gen Motors Corp Electromagnetic spring-wound clutch
US3746137A (en) * 1972-07-07 1973-07-17 Bell & Howell Co Multiple-torque slip clutch
US3831723A (en) * 1973-04-18 1974-08-27 Gen Motors Corp Electromagnetic spring-wound clutch
US4225027A (en) * 1977-09-28 1980-09-30 Diesel Kiki Co., Ltd. Electromagnetic spring-wound clutch

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5135086A (en) * 1990-08-17 1992-08-04 Star Precision Tools, Inc. Assembly tool with rapid release electromagnetic clutch
US5240313A (en) * 1990-09-17 1993-08-31 Sumitomo Electric Industries, Ltd. Estimated vehicle speed detection apparatus for motorcycles
US5598913A (en) * 1995-06-07 1997-02-04 Ntn Corporation One-way over-running clutch pulley
US6394248B1 (en) 2000-05-31 2002-05-28 Ntn Corporation Compression spring complaint one-way over-running clutch pulley
US6581743B2 (en) * 2000-07-10 2003-06-24 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Electromagnetic spring clutches
US6676548B2 (en) * 2000-10-26 2004-01-13 Koyo Seiko Co., Ltd. Fixing structure of a pulley unit
US20060201769A1 (en) * 2005-02-24 2006-09-14 Sanden Corporation Electromagnetic clutch for compressor
US20070289831A1 (en) * 2006-06-15 2007-12-20 Masaki Ota Power transmission mechanism
US20090272615A1 (en) * 2008-05-05 2009-11-05 Buzzard Brian W Permanent magnet wrap spring clutch
US8256598B2 (en) * 2008-05-05 2012-09-04 American Precision Industries, Inc. Permanent magnet wrap spring clutch
US20100230227A1 (en) * 2008-11-17 2010-09-16 Scott Parsons Driven accessory with low-power clutch for activating or de-activating same
US20100122882A1 (en) * 2008-11-17 2010-05-20 Komorowski Jacek S Driven accessory with low-power clutch for activating or de-activating same
US8387767B2 (en) 2008-11-17 2013-03-05 Litens Automotive Partnership Driven accessory with low-power clutch for activating or de-activating same
US8485331B2 (en) 2008-11-17 2013-07-16 Litens Automotive Partnership Driven accessory with low-power clutch for activating or de-activating same
US8851258B2 (en) 2008-11-17 2014-10-07 Litens Automotive Partnership Driven accessory with low-power clutch for activating or de-activating same
US9068603B2 (en) 2010-08-24 2015-06-30 Litens Automotive Partnership Clutched driven device and associated clutch mechanism
USRE47454E1 (en) 2010-08-24 2019-06-25 Litens Automotive Partnership Clutched driven device and associated clutch mechanism
WO2019014777A1 (en) * 2017-07-20 2019-01-24 Litens Automotive Partnership ROTARY CLUTCH ASSEMBLY WITH ACTUATOR HAVING TWO COMPONENT FRAME ASSEMBLED BY VISSING
US11149798B2 (en) 2017-07-20 2021-10-19 Litens Automotive Partnership Rotary clutch assembly with actuator having threadingly engaged two-component armature
US20230167883A1 (en) * 2020-04-28 2023-06-01 Dayco Europe S.R.L. Improved filtering pulley, system comprising such pulley and related control method
US12379018B2 (en) * 2020-04-28 2025-08-05 Muviq S.r.l. Filtering pulley, system comprising such pulley and related control method

Also Published As

Publication number Publication date
JPS5721833U (enrdf_load_stackoverflow) 1982-02-04

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AS Assignment

Owner name: DIESEL KIKI CO.LTD. NO. 6-7,SHIBUYA 3-CHOME,SHIBUY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SHIBUYA, TSUNENORI;REEL/FRAME:003921/0422

Effective date: 19810624

Owner name: DIESEL KIKI CO., LTD., NO. 6-7, SHIBUYA 3-CHOME, S

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SHIBUYA, TSUNENORI;REEL/FRAME:003935/0912

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